Function filterIncompleteToolCalls

src/tools/AgentTool/runAgent.ts:866–904

(messages: Message[])

 * This prevents API errors when sending messages with orphaned tool calls.
 */
export function filterIncompleteToolCalls(messages: Message[]): Message[] {
  // Build a set of tool use IDs that have results
  const toolUseIdsWithResults = new Set<string>()

  for (const message of messages) {
    if (message?.type === 'user') {
      const userMessage = message as UserMessage
      const content = userMessage.message.content
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'tool_result' && block.tool_use_id) {
            toolUseIdsWithResults.add(block.tool_use_id)
          }
        }
      }
    }
  }

  // Filter out assistant messages that contain tool calls without results
  return messages.filter(message => {
    if (message?.type === 'assistant') {
      const assistantMessage = message as AssistantMessage
      const content = assistantMessage.message.content
      if (Array.isArray(content)) {
        // Check if this assistant message has any tool uses without results
        const hasIncompleteToolCall = content.some(
          block =>
            block.type === 'tool_use' &&
            block.id &&
            !toolUseIdsWithResults.has(block.id),
        )
        // Exclude messages with incomplete tool calls
        return !hasIncompleteToolCall
      }
    }
    // Keep all non-assistant messages and assistant messages without tool calls
    return true
  })
}

async function getAgentSystemPrompt(
  agentDefinition: AgentDefinition,